US9454062B2 - Observation optical system, viewfinder equipped with observation optical system and method for manufacturing observation optical system - Google Patents
Observation optical system, viewfinder equipped with observation optical system and method for manufacturing observation optical system Download PDFInfo
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- US9454062B2 US9454062B2 US13/237,905 US201113237905A US9454062B2 US 9454062 B2 US9454062 B2 US 9454062B2 US 201113237905 A US201113237905 A US 201113237905A US 9454062 B2 US9454062 B2 US 9454062B2
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- 230000003287 optical effect Effects 0.000 title claims abstract description 194
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 22
- 230000014509 gene expression Effects 0.000 claims abstract description 89
- 230000004075 alteration Effects 0.000 description 30
- 206010010071 Coma Diseases 0.000 description 27
- 230000000694 effects Effects 0.000 description 14
- 238000012937 correction Methods 0.000 description 13
- 239000004973 liquid crystal related substance Substances 0.000 description 6
- 230000000007 visual effect Effects 0.000 description 4
- 241000226585 Antennaria plantaginifolia Species 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 201000009310 astigmatism Diseases 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B13/00—Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0035—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having three lenses
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
- G02B9/12—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having three components only
- G02B9/14—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having three components only arranged + - +
- G02B9/16—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having three components only arranged + - + all the components being simple
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49826—Assembling or joining
Definitions
- the present invention relates to an observation optical system for observing a compact display panel, a viewfinder equipped with the observation optical system, and a method for manufacturing the observation optical system.
- a viewfinder capable of observing a compact display panel with a high magnification has been proposed (see, for example, Japanese Patent Application Laid-Open No. 2002-048985).
- the conventional observation optical system installed in the conventional viewfinder has had a problem that correction of aberrations is not sufficient.
- the present invention is made in view of the above-described problem, and has an object to provide a compact observation optical system having excellent optical performance, a viewfinder equipped with the observation optical system, and a method for manufacturing the observation optical system.
- an observation optical system for observing an object comprising, in order from the object side: a first lens having positive refractive power; a second lens having negative refractive power and a concave surface facing the object side; and a third lens having positive refractive power and a convex surface facing an eyepoint side, an aspherical surface being included on at least one lens surface, and the following conditional expressions being satisfied: 0.80 ⁇ ( R 22 +R 21)/( R 22 ⁇ R 21) ⁇ 2.00 1.30 ⁇ f 1/( ⁇ f 2) ⁇ 2.00 where R21 denotes a radius of curvature of the object side lens surface of the second lens, R22 denotes a radius of curvature of the eyepoint side lens surface of the second lens, f1 denotes a focal length of the first lens, and f2 denotes a focal length of the second lens.
- a viewfinder equipped with an image display panel and the observation optical system according to the first aspect.
- an optical apparatus equipped with the observation optical system according to the first aspect.
- a viewfinder comprising: an image display panel; and an observation optical system for observing an image displayed on the image display panel, the observation optical system consisting of, in order from the image display panel side, a first lens having positive refractive power, a second lens having negative refractive power and a concave surface facing the image display panel side, and a third lens having positive refractive power and a convex surface facing an eyepoint side, an aspherical surface being formed on either one of the first lens and the third lens, and the following conditional expression being satisfied: 0.20 ⁇ h/TL ⁇ 0.35 where h denotes an object height, and TL denotes a distance between the object plane and the most eyepoint side lens surface.
- an optical apparatus equipped with the view finder according to the fourth aspect.
- a method for manufacturing an observation optical system including, in order from an object side, a first lens having positive refractive power, a second lens having negative refractive power, and a third lens having positive refractive power, the method comprising steps of: disposing a concave surface on the object side lens surface of the second lens; disposing a convex surface on an eyepoint side lens surface of the third lens; disposing an aspherical surface on at least one of the first lens through the third lens; and disposing each lens with satisfying the following conditional expressions: 0.80 ⁇ ( R 22 +R 21)/( R 22 ⁇ R 21) ⁇ 2.00 1.30 ⁇ f 1/( ⁇ f 2) ⁇ 2.00 where R21 denotes a radius of curvature of the object side lens surface of the second lens, R22 denotes a radius of curvature of the eyepoint side lens surface of the second lens, f1 denotes a focal length of the first lens, and f2 denotes
- a method for manufacturing a view finder including an image display panel and an observation optical system for observing an image displayed on the image display panel, the method comprising steps of: disposing, in order from the image display panel side, a first lens having positive refractive power, a second lens having negative refractive power and a concave surface facing the image display panel side, and a third lens having positive refractive power and a convex surface facing an eyepoint side, into the observation optical system; disposing an aspherical surface on either one of the first lens and the third lens; and disposing each lens with satisfying the following conditional expression: 0.20 ⁇ h/TL ⁇ 0.35 where h denotes an object height, and TL denotes a distance between the object plane and the most eyepoint side lens surface.
- the present invention makes it possible to provide a compact observation optical system having excellent optical performance, a viewfinder equipped with the observation optical system, and a method for manufacturing the observation optical system.
- FIG. 1 is a sectional view showing a configuration of an observation optical system according to Example 1 of the present application.
- FIG. 2 shows various aberrations of the observation optical system according to Example 1 upon adjusting diopter to ⁇ 1 (m ⁇ 1 ).
- FIG. 3 is a sectional view showing a configuration of an observation optical system according to Example 2 of the present application.
- FIG. 4 shows various aberrations of the observation optical system according to Example 2 upon adjusting diopter to ⁇ 1 (m ⁇ 1 ).
- FIG. 5 is a sectional view showing a configuration of an observation optical system according to Example 3 of the present application.
- FIG. 6 shows various aberrations of the observation optical system according to Example 3 upon adjusting diopter to ⁇ 1 (m ⁇ 1 ).
- FIG. 7 is a sectional view showing a configuration of an observation optical system according to Example 4 of the present application.
- FIG. 8 shows various aberrations of the observation optical system according to Example 4 upon adjusting diopter to ⁇ 1 (m ⁇ 1 ).
- FIG. 9 is a sectional view showing a configuration of an observation optical system according to Example 5 of the present application.
- FIG. 10 shows various aberrations of the observation optical system according to Example 5 upon adjusting diopter to ⁇ 1 (m ⁇ 1 ).
- FIG. 11 is a sectional view showing a configuration of a viewfinder equipped with the observation optical system according to the present application.
- FIG. 12 is a flowchart showing an outline of a method for manufacturing an observation optical system according to the present application.
- observation optical system An observation optical system, a viewfinder equipped with the observation optical system and a method for manufacturing the observation optical system according to the present application will be explained below.
- An observation optical system is an observation optical system for observing an image display panel displaying an image.
- the image display panel includes a liquid crystal panel, a screen and a focusing screen for displaying an image of an object to be photographed in an imaging apparatus such as a camera.
- the following explanation is made an observation optical system for observing a liquid crystal panel as an example.
- An observation optical system is an observation optical system for observing an object that is an image display panel and includes, in order from the object side, a first lens having positive refractive power, a second lens having negative refractive power and a concave surface facing the object side, and a third lens having positive refractive power and a convex surface facing an eyepoint side. At least one aspherical surface is included.
- an observation optical system With disposing the first lens having positive refractive power to the object side, an observation optical system according to the present application makes it possible to realize both of securing an object-space telecentricity and making the observation optical system compact. Moreover, with disposing the second lens having negative refractive power and a concave surface facing the object side, it becomes possible to correct spherical aberration and distortion generated in the first lens. Furthermore, with disposing the third lens having positive refractive power and a convex surface facing the eyepoint side, it becomes possible to realize both of a high magnification and compactness and to correct coma and distortion.
- Conditional expression (1) is for defining the shape of the second lens.
- strong concave surface means that the radius of curvature of the lens surface is small, in other words, curvature of the lens surface is large.
- a paraxial radius of curvature is to be used as a radius of curvature.
- Conditional expression (2) is for defining a ratio of the focal length of the first lens to that of the second lens. With satisfying conditional expression (2), it becomes possible to realize both of high magnification and an object-space telecentricity, and to excellently correct coma. In particular, when the observation optical system is for observing a liquid crystal panel, telecentricity has to be secured because of narrow field angle of view of the liquid crystal panel. Otherwise, the image of peripheral portion of the liquid crystal panel becomes extremely difficult to be observed because of color smear and insufficient light amount.
- conditional expression (3) is preferably satisfied: 0.50 ⁇ ( ⁇ 1) ⁇ (( R 32 +R 31)/( R 32 ⁇ R 31)) ⁇ 1.00 (3)
- R31 denotes a radius of curvature of the object side lens surface of the third lens
- R32 denotes a radius of curvature of the eyepoint side lens surface of the third lens.
- Conditional expression (3) is for defining the shape of the third lens. With disposing strong convex surface to the eyepoint side of the third lens and satisfying conditional expression (3), it becomes possible to secure a proper magnification and eyepoint in spite of shortening the total length of the optical system. Moreover, coma and curvature of field can be excellently corrected.
- the strong convex surface means that the radius of curvature of the lens surface is small, in other words, curvature of the lens surface is large.
- conditional expression (3) when the value ( ⁇ 1) ⁇ ((R32+R31)/(R32 ⁇ R31)) is equal to or exceeds the upper limit of conditional expression (3), a light ray corresponding to a large angle of view is incident on the lens surface with a large angle, so that coma and curvature of field are excessively generated. Accordingly, these aberrations become difficult to be corrected, so that it is undesirable.
- conditional expression (4) is preferably satisfied: 0.05 ⁇ d 12 /TL ⁇ 0.30 (4) where d12 denotes a distance between the eyepoint side lens surface of the first lens and the object side lens surface of the second lens, and TL denotes a distance between the object plane and the most eyepoint side lens surface.
- Conditional expression (4) is for defining the distance between the first lens group and the second lens group. With satisfying conditional expression (4), it becomes possible to excellently correct coma. Coma excessively generated in the first lens can be corrected by the negative refractive surface of the second lens by means of providing a suitable distance between the first lens and the second lens. Accordingly, it becomes possible to excellently correct coma with increasing magnification.
- TL is to be an air converted total length when a plane parallel plate is inserted.
- the ratio d12/TL is equal to or exceeds the upper limit of conditional expression (4)
- the distance between the first lens and the second lens becomes large, and correction of coma on the periphery becomes excessive, so that it is undesirable.
- conditional expression (5) is preferably satisfied: 0.90 ⁇ f 1 /f 3 ⁇ 2.30 (5) where f3 denotes a focal length of the third lens.
- Conditional expression (5) is for excellently correcting distortion and coma deteriorated upon increasing positive refractive power of the first lens and the third lens accompanied with increasing magnification of the optical system. With satisfying conditional expression (5), distortion largely generated in the first lens is corrected a little too much by the second lens, and the excessive amount can be corrected by distortion generated in the third lens.
- the ratio f1/f3 is equal to or exceeds the upper limit of conditional expression (5)
- the correction amount of distortion by the second lens becomes excessive, and negative distortion is generated.
- visual field becomes distorted to a barrel shape, so that it is undesirable.
- coma generated in the second lens becomes excessively large, so that it becomes difficult to correct coma by the third lens. Accordingly, it is undesirable.
- all of the first lens, the second lens and the third lens are preferably made from plastic materials.
- plastic materials With constructing all of lenses from plastic materials, it becomes possible to reduce manufacturing cost and to save weight. Moreover, plastic materials are easy to be processed, so that lenses having excellent optical performance can be manufactured.
- an aspherical surface is preferably formed on the object side lens surface of the second lens.
- an aspherical surface is preferably formed on the eyepoint side lens surface of the third lens.
- conditional expression (6) is preferably satisfied: 0.20 ⁇ h/TL ⁇ 0.35 (6) where h denotes an object height, and TL denotes a distance between the object and the most eyepoint side lens surface.
- Conditional expression (6) is for defining the total length of the optical system with respect to the object (image display panel) height. With satisfying conditional expression (6), observation can be carried out with a proper magnification.
- conditional expression (7) is preferably satisfied: 5.60 ⁇ h ⁇ 12.00 (7).
- Conditional expression (7) defines the size of the object (image display panel) to be observed. With satisfying conditional expression (7), observation can be carried out with a proper magnification.
- a viewfinder according to the present application is equipped with an image display panel, and the above-described observation optical system. With this configuration, it becomes possible to realize a compact viewfinder having excellent optical performance.
- a distance between the image display panel and the object side lens surface of the first lens is varied, thereby carrying out diopter adjustment.
- respective distances between the first through third lenses do not varied upon carrying out diopter adjustment.
- a viewfinder includes an image display panel and an observation optical system for observing an image displayed on the image display panel.
- the observation optical system consists of, in order from the image display panel side, a first lens having positive refractive power, a second lens having negative refractive power and a concave surface facing the image display panel side, and a third lens having positive refractive power and a convex surface facing an eyepoint side.
- An aspherical surface is formed on either one of the first lens and the third lens.
- the following conditional expression (6) is satisfied: 0.20 ⁇ h/TL ⁇ 0.35 (6) where h denotes an object height, and TL denotes a distance between the object plane and the most eyepoint side lens surface.
- conditional expression (6) is for defining the total length of the optical system with respect to the object (image display panel) height. With satisfying conditional expression (6), observation can be carried out with a proper magnification.
- conditional expression (7) is preferably satisfied: 5.60 ⁇ h ⁇ 12.00 (7).
- conditional expression (7) defines the size of the object (image display panel) to be observed. With satisfying conditional expression (7), observation can be carried out with a proper magnification.
- a method for manufacturing an observation optical system is a method for manufacturing an observation optical system including, in order from an object side, a first lens having positive refractive power, a second lens having negative refractive power, and a third lens having positive refractive power, the method comprising steps of:
- each lens with satisfying the following conditional expressions (1) and (2): 0.80 ⁇ ( R 22 +R 21)/( R 22 ⁇ R 21) ⁇ 2.00 (1) 1.10 ⁇ f 1/( ⁇ f 2) ⁇ 2.00 (2)
- R21 denotes a radius of curvature of the object side lens surface of the second lens
- R22 denotes a radius of curvature of the eyepoint side lens surface of the second lens
- f1 denotes a focal length of the first lens
- f2 denotes a focal length of the second lens.
- FIG. 1 is a sectional view showing a configuration of an observation optical system according to Example 1 of the present application.
- the observation optical system according to Example 1 is composed of, in order from a display plane O side of an image display panel, a first lens G 1 having positive refractive power, a second lens G 2 having negative refractive power and a concave surface facing the display plane O side, and a third lens G 3 having positive refractive power and a convex surface facing an eyepoint EP side.
- Example 1 all of the first lens G 1 , the second lens G 2 and the third lens G 3 are plastic lenses. In Example 1, an aspherical surface is used on the display plane O side of the second lens G 2 and the eyepoint EP side of the third lens G 3 .
- the first lens G 1 , the second lens G 2 and the third lens G 3 are moved in a body along an optical axis, thereby carrying out diopter adjustment. On this occasion, respective distances between the first lens G 1 through the third lens G 3 do not vary.
- a surface number “i” represents an order of the lens surface from the display plane O side along the direction in which the light beams travel
- r denotes a radius of curvature of each optical surface
- d indicates a distance along an optical axis
- f1 denotes a focal length of the first lens G 1
- f2 denotes a focal length of the second lens G 2
- f3 denotes a focal length of the third lens G 3
- h denotes an object height
- TL denotes a total length of the optical system.
- the total length of the optical system TL is a distance along the optical axis between the image display plane O and the most eyepoint EP side lens surface.
- TL denotes an air converted total length.
- mm is generally used for the unit of length such as the focal length, the radius of curvature and the distance to the next lens surface.
- the unit is not necessarily to be limited to “mm”, and any other suitable unit can be used.
- FIG. 2 shows various aberrations of the observation optical system according to Example 1 upon adjusting diopter to ⁇ 1 (m ⁇ 1 ).
- m ⁇ 1 is a unit of diopter
- diopter X (m ⁇ 2 ) means that an image formed by the eyepiece is located on the optical axis at a position of ⁇ 1/X (m) from the eyepoint EP.
- the sign is to be positive when the image is formed to the observer side of the eyepoint EP, and negative when the image is formed to the display plane O side of the eyepoint EP.
- spherical aberration, astigmatism, coma and curvature of field are shown.
- Y1 denotes a height of ray incident on the optical system
- Y0 denotes a height of the display panel.
- unit of horizontal axis is (m ⁇ 1 ) and shown by “D”.
- “min” is a unit of angle that is a minute of arc and is 1/60 degree.
- Example 1 shows superb optical performance as a result of good corrections to various aberrations, in particular, to coma and distortion.
- FIG. 3 is a sectional view showing a configuration of an observation optical system according to Example 2 of the present application.
- the observation optical system according to Example 2 of the present application is similar lens configuration as the one according to Example 1. Moreover, in the observation optical system according to Example 2, an aspherical surface is used on the display plane O side of the second lens G 2 and the eyepoint EP side of the third lens G 3 .
- FIG. 4 shows various aberrations of the observation optical system according to Example 2 upon adjusting diopter to ⁇ 1 (m ⁇ 1 ).
- Example 2 shows superb optical performance as a result of good corrections to various aberrations, in particular, to coma and distortion.
- FIG. 5 is a sectional view showing a configuration of an observation optical system according to Example 3 of the present application.
- the observation optical system according to Example 3 of the present application is similar lens configuration as the one according to Example 1. Moreover, in the observation optical system according to Example 3, an aspherical surface is used on the display plane O side of the second lens G 2 and the eyepoint EP side of the third lens G 3 .
- FIG. 6 shows various aberrations of the observation optical system according to Example 3 upon adjusting diopter to ⁇ 1 (m ⁇ 1 ).
- Example 3 shows superb optical performance as a result of good corrections to various aberrations, in particular, to coma and distortion.
- FIG. 7 is a sectional view showing a configuration of an observation optical system according to Example 4 of the present application.
- the observation optical system according to Example 4 of the present application is similar lens configuration as the one according to Example 1. Moreover, in the observation optical system according to Example 4, an aspherical surface is used on the eyepoint EP side of the first lens G 1 , the display plane O side of the second lens G 2 and the eyepoint EP side of the third lens G 3 .
- FIG. 8 shows various aberrations of the observation optical system according to Example 4 upon adjusting diopter to ⁇ 1 (m ⁇ 1 ).
- Example 4 shows superb optical performance as a result of good corrections to various aberrations, in particular, to coma and distortion.
- FIG. 9 is a sectional view showing a configuration of an observation optical system according to Example 5 of the present application.
- the observation optical system according to Example 5 of the present application is composed of, in order from a display plane O side of an image display panel, a first lens G 1 having positive refractive power, a second lens G 2 having negative refractive power and a concave surface facing the display plane O side, a third lens G 3 having positive refractive power and a convex surface facing an eyepoint EP side, and a fourth lens G 4 having positive refractive power and a concave surface facing the display plane O side.
- the lens configuration according to Example 5 is a four-lens-group configuration.
- all of the lenses are plastic lenses.
- an aspherical surface is used on the display plane O side of the second lens G 2 , the eyepoint EP side of the third lens G 3 and the eyepoint EP side of the fourth lens G 4 .
- FIG. 10 shows various aberrations of the observation optical system according to Example 5 upon adjusting diopter to ⁇ 1 (m ⁇ 1 ).
- Example 5 shows superb optical performance as a result of good corrections to various aberrations, in particular, to coma and distortion.
- FIG. 11 is a sectional view showing a configuration of a viewfinder equipped with the observation optical system according to the present application.
- the viewfinder 1 is equipped with an image display 5 for displaying an image, and an observation optical system 7 for observing the image displayed on the image display 5 , which are installed in a finder case 3 having a light blocking function. An observer can observe the image displayed on the image display 5 through the observation optical system 7 .
- the image display 5 may be constructed by a display panel composed of an image display device such as a liquid crystal display (LCD), and a back light integrally constructed on the rear side of the display panel.
- LCD liquid crystal display
- Diopter adjustment of the viewfinder 1 is carried out by moving the whole of the observation optical system 7 integrally along the optical axis.
- a distance between a display surface O of the image display 5 and the image display 5 side surface of the first lens G 1 disposed to the most image display 5 side of the observation optical system 7 is varied, thereby carrying out diopter adjustment.
- distances between the first lens G 1 , the second lens G 2 and the third lens G 3 are not varied. In this manner, with moving the observation optical system 7 integrally, the viewfinder 1 makes it possible to carry out diopter adjustment.
- observation optical system 7 may be applied to a viewfinder composed of a focusing screen substituting the image display panel of the image display 5 shown in FIG. 11 .
- an optical system (not shown) for forming an image on the focusing screen is to dispose additionally.
- FIG. 12 is a flowchart showing an outline of a method for manufacturing an observation optical system according to the present application.
- a method for manufacturing an observation optical system is a method for manufacturing an observation optical system including a first lens G 1 having positive refractive power, a second lens G 2 having negative refractive power, and a third lens G 3 having positive refractive power, the method includes the following steps S 1 through S 4 .
- Step S 1 disposing a concave surface on the display surface O side of the second lens G 2 .
- Step S 2 disposing a convex surface on the eyepoint EP side of the third lens G 3 .
- Step S 3 disposing an aspherical surface on at least one surface of the first lens G 1 , the second lens G 2 and the third lens G 3 .
- Step S 4 disposing each lens into a viewfinder case with satisfying the following conditional expressions (1) and (2): 0.80 ⁇ ( R 22 +R 21)/( R 22 ⁇ R 21) ⁇ 2.00 (1) 1.10 ⁇ f 1/( ⁇ f 2) ⁇ 2.00 (2)
- R21 denotes a radius of curvature of the object side lens surface of the second lens
- R22 denotes a radius of curvature of the eyepoint side lens surface of the second lens
- f1 denotes a focal length of the first lens
- f2 denotes a focal length of the second lens.
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Abstract
Description
0.80<(R22+R21)/(R22−R21)<2.00
1.30<f1/(−f2)<2.00
where R21 denotes a radius of curvature of the object side lens surface of the second lens, R22 denotes a radius of curvature of the eyepoint side lens surface of the second lens, f1 denotes a focal length of the first lens, and f2 denotes a focal length of the second lens.
0.20<h/TL<0.35
where h denotes an object height, and TL denotes a distance between the object plane and the most eyepoint side lens surface.
0.80<(R22+R21)/(R22−R21)<2.00
1.30<f1/(−f2)<2.00
where R21 denotes a radius of curvature of the object side lens surface of the second lens, R22 denotes a radius of curvature of the eyepoint side lens surface of the second lens, f1 denotes a focal length of the first lens, and f2 denotes a focal length of the second lens.
0.20<h/TL<0.35
where h denotes an object height, and TL denotes a distance between the object plane and the most eyepoint side lens surface.
0.80<(R22+R21)/(R22−R21)<2.00 (1)
1.10<f1/(−f2)<2.00 (2)
where R21 denotes a radius of curvature of the object side lens surface of the second lens, R22 denotes a radius of curvature of the eyepoint side lens surface of the second lens, f1 denotes a focal length of the first lens, and f2 denotes a focal length of the second lens.
0.50<(−1)×((R32+R31)/(R32−R31))<1.00 (3)
where R31 denotes a radius of curvature of the object side lens surface of the third lens, and R32 denotes a radius of curvature of the eyepoint side lens surface of the third lens.
0.05<d12/TL<0.30 (4)
where d12 denotes a distance between the eyepoint side lens surface of the first lens and the object side lens surface of the second lens, and TL denotes a distance between the object plane and the most eyepoint side lens surface.
0.90<f1/f3<2.30 (5)
where f3 denotes a focal length of the third lens.
0.20<h/TL<0.35 (6)
where h denotes an object height, and TL denotes a distance between the object and the most eyepoint side lens surface.
5.60<h<12.00 (7).
0.20<h/TL<0.35 (6)
where h denotes an object height, and TL denotes a distance between the object plane and the most eyepoint side lens surface.
5.60<h<12.00 (7).
0.80<(R22+R21)/(R22−R21)<2.00 (1)
1.10<f1/(−f2)<2.00 (2)
where R21 denotes a radius of curvature of the object side lens surface of the second lens, R22 denotes a radius of curvature of the eyepoint side lens surface of the second lens, f1 denotes a focal length of the first lens, and f2 denotes a focal length of the second lens.
x(y)=(y 2 /r)/[1+(1−k×y 2 /r 2)1/2 ]+A4×y 4 +A6×y 6 +A8×y 8 +A10×y 10.
TABLE 1 |
(Lens Surface Data) |
i | r | d | nd | νd |
O | ∞ | 12.2 | ||
1 | 40.2000 | 4.0 | 1.52444 | 56.21 |
2 | −12.0830 | 2.5 | ||
*3 | −6.3017 | 2.0 | 1.58276 | 30.33 |
4 | −79.5000 | 2.3 | ||
5 | 44.4703 | 5.0 | 1.52444 | 56.21 |
*6 | −10.6223 | 16.5 | ||
(Aspherical Surface Data) |
Surface Number: 3 | ||
κ = 0.37241 | ||
A4 = −6.2397E−05 | ||
A6 = 6.4550E−07 | ||
A8 = 2.6617E−08 | ||
Surface Number: 6 | ||
κ = 0.0765 | ||
A4 = 1.0462E−05 | ||
A6 = 2.9625E−07 | ||
A8 = −8.3646E−10 | ||
(Specifications) |
f1 = 18.194 | ||
f2 = −11.86 | ||
f3 = 16.876 | ||
h = 6.3 | ||
TL = 27.99 | ||
(Values for Conditional Expressions) |
f1 = 18.194 | ||
f2 = −11.86 | ||
f3 = 16.876 | ||
R21 = −6.3017 | ||
R22 = −79.5000 | ||
R31 = 44.4703 | ||
R32 = −10.6223 | ||
d12 = 2.5 | ||
TL = 27.99 | ||
h = 6.3 | ||
(1) (R22 + R21)/(R22 − R21) = 1.172 | ||
(2) f1/(−f2) = 1.534 | ||
(3) (−1) × {(R32 + R31)/(R32 − R31)} = 0.614 | ||
(4) d12/TL = 0.089 | ||
(5) f1/f3 = 1.078 | ||
(6) h/TL = 0.225 | ||
(7) h = 6.3 | ||
TABLE 2 |
(Lens Surface Data) |
i | r | d | nd | νd |
O | ∞ | 15.0 | ||
1 | 42.2697 | 5.1 | 1.53110 | 55.80 |
2 | −16.6641 | 3.9 | ||
*3 | −7.7224 | 2.8 | 1.60740 | 27.03 |
4 | −31.6766 | 2.2 | ||
5 | 108.2386 | 5.0 | 1.53110 | 55.80 |
*6 | −13.0500 | 18.4 | ||
(Aspherical Surface Data) |
Surface Number: 3 | ||
κ = 0.28820 | ||
A4 = −0.00003 | ||
A6 = 1.8126E−07 | ||
A8 = 5.4940E−09 | ||
Surface Number: 6 | ||
κ = −0.31553 | ||
A4 = −8.5592E−06 | ||
A6 = 1.3409E−07 | ||
A8 = −2.2059E−10 | ||
(Specifications) |
f1 = 23.2482 | ||
f2 = −17.59 | ||
f3 = 29.07 | ||
h = 8.2 | ||
TL = 34.00 | ||
(Values for Conditional Expressions) |
f1 = 23.2482 | ||
f2 = −17.59 | ||
f3 = 29.07 | ||
R21 = −7.7224 | ||
R22 = −31.6766 | ||
R31 = 108.2386 | ||
R32 = −13.0500 | ||
d12 = 3.9 | ||
TL = 34.00 | ||
h = 8.2 | ||
(1) (R22 + R21)/(R22 − R21) = 1.645 | ||
(2) f1/(−f2) = 1.322 | ||
(3) (−1) × {(R32 + R31)/(R32 − R31)} = 0.785 | ||
(4) d12/TL = 0.115 | ||
(5) f1/f3 = 1.043 | ||
(6) h/TL = 0.241 | ||
(7) h = 8.2 | ||
TABLE 3 |
(Lens Surface Data) |
i | r | d | nd | νd |
O | ∞ | 11.6 | ||
1 | −549.7055 | 2.6 | 1.52444 | 56.21 |
2 | −13.1935 | 4.9 | ||
*3 | −8.2614 | 2.0 | 1.60737 | 27.03 |
4 | −351.8917 | 3.2 | ||
5 | 162.5158 | 3.9 | 1.52444 | 56.21 |
*6 | −9.3659 | 19.0 | ||
(Aspherical Surface Data) |
Surface Number: 3 | ||
κ = 1.10431 | ||
A4 = −0.00013 | ||
A6 = −1.2165E−06 | ||
A8 = −3.8906E−08 | ||
Surface Number: 6 | ||
κ = 0.66739 | ||
A4 = 9.0632E−06 | ||
A6 = −8.8470E−08 | ||
A8 = 3.7156E−09 | ||
(Specifications) |
f1 = 25.7331 | ||
f2 = −13.96 | ||
f3 = 17.019 | ||
h = 6.3 | ||
TL = 28.2 | ||
(Values for Conditional Expressions) |
f1 = 25.7331 | ||
f2 = −13.96 | ||
f3 = 17.019 | ||
R21 = −8.2614 | ||
R22 = −351.8917 | ||
R31 = 162.5158 | ||
R32 = −9.3659 | ||
d12 = 4.9 | ||
TL = 28.2 | ||
h = 6.3 | ||
(1) (R22 + R21)/(R22 − R21) = 1.048 | ||
(2) f1/(−f2) = 1.843 | ||
(3) (−1) × {(R32 + R31)/(R32 − R31)} = 0.891 | ||
(4) d12/TL = 0.174 | ||
(5) f1/f3 = 1.512 | ||
(6) h/TL = 0.223 | ||
(7) h = 6.3 | ||
TABLE 4 |
(Lens Surface Data) |
i | r | d | nd | νd |
O | ∞ | 12.9 | ||
1 | 388.9349 | 3.7 | 1.53110 | 55.91 |
*2 | −9.8898 | 2.9 | ||
*3 | −5.7147 | 2.0 | 1.58276 | 30.33 |
4 | −40.9279 | 0.7 | ||
5 | 74.0852 | 5.8 | 1.53110 | 55.91 |
*6 | −9.3344 | 20.0 | ||
(Aspherical Surface Data) |
Surface Number: 2 | ||
κ = 0.72042 | ||
A4 = 0.52402E−04 | ||
A6 = 0.13508E−05 | ||
A8 = −0.10764E−07 | ||
Surface Number: 3 | ||
κ = 0.24355 | ||
A4 = −0.10662E−03 | ||
A6 = 0.26311E−05 | ||
A8 = −0.12815E−07 | ||
Surface Number: 6 | ||
κ = 0.13940 | ||
A4 = −0.44120E−07 | ||
A6 = 0.42345E−06 | ||
A8 = −0.12391E−08 | ||
(Specifications) |
f1 = 18.426 | ||
f2 = −11.45 | ||
f3 = 16.175 | ||
h = 6.3 | ||
TL = 28.04 | ||
(Values for Conditional Expressions) |
f1 = 18.426 | ||
f2 = −11.45 | ||
f3 = 16.175 | ||
R21 = −5.7147 | ||
R22 = −40.9279 | ||
R31 = 74.0852 | ||
R32 = −9.3344 | ||
d12 = 2.9 | ||
TL = 28.04 | ||
h = 6.3 | ||
(1) (R22 + R21)/(R22 − R21) = 1.307 | ||
(2) f1/(−f2) = 1.609 | ||
(3) (−1) × {(R32 + R31)/(R32 − R31)} = 0.776 | ||
(4) d12/TL = 0.103 | ||
(5) f1/f3 = 1.139 | ||
(6) h/TL = 0.225 | ||
(7) h = 6.3 | ||
TABLE 5 |
(Lens Surface Data) |
i | r | d | nd | νd |
O | ∞ | 11.5 | ||
1 | 49.0892 | 3.6 | 1.53110 | 55.91 |
2 | −13.2827 | 3.4 | ||
*3 | −6.1837 | 1.1 | 1.58276 | 30.33 |
4 | −319.4041 | 1.5 | ||
5 | 61.1530 | 3.6 | 1.53110 | 55.91 |
*6 | −12.6578 | 0.6 | ||
7 | −27.0537 | 2.8 | 1.53110 | 55.91 |
*8 | −12.6623 | 19.5 | ||
(Aspherical Surface Data) |
Surface Number: 3 | ||
κ = −0.01163 | ||
A4 = −0.24916E−03 | ||
A6 = 0.76100E−06 | ||
A8 = 0.13807E−07 | ||
Surface Number: 6 | ||
κ = 0.11130 | ||
A4 = 0.29151E−04 | ||
A6 = 0.12134E−05 | ||
A8 = −0.22326E−08 | ||
Surface Number: 8 | ||
κ = 1.28631 | ||
A4 = 0.51446E−04 | ||
A6 = −0.43976E−06 | ||
A8 = 0.58471E−08 | ||
(Specifications) |
f1 = 20.086 | ||
f2 = −10.84 | ||
f3 = 20.086 | ||
h = 6.3 | ||
TL = 28.14 | ||
(Values for Conditional Expressions) |
f1 = 20.086 | ||
f2 = −10.84 | ||
f3 = 20.086 | ||
R21 = −6.1837 | ||
R22 = −319.4041 | ||
R31 = 61.1530 | ||
R32 = −12.6578 | ||
d12 = 3.4 | ||
TL = 28.14 | ||
h = 6.3 | ||
(1) (R22 + R21)/(R22 − R21) = 1.039 | ||
(2) f1/(−f2) = 1.854 | ||
(3) (−1) × {(R32 + R31)/(R32 − R31)} = 0.657 | ||
(4) d12/TL = 0.121 | ||
(5) f1/f3 = 1.000 | ||
(6) h/TL = 0.224 | ||
(7) h = 6.3 | ||
0.80<(R22+R21)/(R22−R21)<2.00 (1)
1.10<f1/(−f2)<2.00 (2)
where R21 denotes a radius of curvature of the object side lens surface of the second lens, R22 denotes a radius of curvature of the eyepoint side lens surface of the second lens, f1 denotes a focal length of the first lens, and f2 denotes a focal length of the second lens.
Claims (24)
0.80<(R22+R21)/(R22−R21)<2.00
1.534≦f1/(−f2)<2.00
0.50<(−1)×((R32+R31)/(R32−R31))<1.00
0.05<d12/TL<0.30
0.90<f1/f3<2.30
0.20<h/TL<0.35
5.60<h<12.00
0.20<h/TL<0.26
5.60<h<12.00
0.80<(R22+R21)/(R22−R21)<2.00
1.534≦f1/(−f2)<2.00
0.50<(−1)×((R32+R31)/(R32−R31))<1.00
0.05<d12/TL<0.30
0.90<f1/f3<2.30
0.20<h/TL<0.26
5.60<h<12.00
0.20<h/TL<0.35
5.60<h<12.00
0.20<h/TL<0.35
5.60<h<12.00
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Citations (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0540232A (en) | 1991-08-08 | 1993-02-19 | Olympus Optical Co Ltd | Wide visual field eyepiece |
JPH06258582A (en) | 1993-03-04 | 1994-09-16 | Ishikawa Koki Seisakusho:Kk | Ocular lense system with extremely small distortion |
JPH07152068A (en) | 1993-11-29 | 1995-06-16 | Canon Inc | Finder device |
JP2001324741A (en) | 2000-05-17 | 2001-11-22 | Olympus Optical Co Ltd | Image pickup device |
JP2002048985A (en) | 2000-08-02 | 2002-02-15 | Minolta Co Ltd | Eyepiece optical system |
US20040165278A1 (en) | 2003-02-24 | 2004-08-26 | Eastman Kodak Company | Optical magnifier suitable for use with a microdisplay device |
JP2006106491A (en) | 2004-10-07 | 2006-04-20 | Canon Inc | View finder |
JP2007121340A (en) | 2005-10-25 | 2007-05-17 | Citizen Miyota Co Ltd | Eyepiece for finder |
US7301712B2 (en) * | 2003-01-09 | 2007-11-27 | Olympus Corporation | Image-formation optical system, and imaging system incorporating the same |
JP2008096552A (en) | 2006-10-10 | 2008-04-24 | Ricoh Co Ltd | Observing optical system, lens barrel unit, and camera |
JP2008203290A (en) | 2007-02-16 | 2008-09-04 | Sony Corp | Viewfinder |
US7492533B2 (en) * | 2003-09-10 | 2009-02-17 | Panasonic Corporation | Imaging lens, imaging unit, and optical device |
JP2010175795A (en) | 2009-01-29 | 2010-08-12 | Nikon Corp | Eyepiece optical system |
US20100290129A1 (en) | 2009-05-18 | 2010-11-18 | Nishio Akinori | Eyepiece optical system and electronic view finder incorporating the same |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100470292C (en) * | 2006-03-28 | 2009-03-18 | 富士能株式会社 | Imaging lens |
JP4949711B2 (en) * | 2006-03-28 | 2012-06-13 | 富士フイルム株式会社 | Imaging lens |
-
2010
- 2010-09-21 JP JP2010210763A patent/JP5136618B2/en active Active
-
2011
- 2011-09-20 US US13/237,905 patent/US9454062B2/en active Active
- 2011-09-21 CN CN201110293483.5A patent/CN102411191B/en active Active
Patent Citations (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0540232A (en) | 1991-08-08 | 1993-02-19 | Olympus Optical Co Ltd | Wide visual field eyepiece |
JPH06258582A (en) | 1993-03-04 | 1994-09-16 | Ishikawa Koki Seisakusho:Kk | Ocular lense system with extremely small distortion |
JPH07152068A (en) | 1993-11-29 | 1995-06-16 | Canon Inc | Finder device |
US5546224A (en) | 1993-11-29 | 1996-08-13 | Canon Kabushiki Kaisha | Viewfinder device wherein the spacing between the display and the optical system is variable to effect diopter adjustment |
JP2001324741A (en) | 2000-05-17 | 2001-11-22 | Olympus Optical Co Ltd | Image pickup device |
JP2002048985A (en) | 2000-08-02 | 2002-02-15 | Minolta Co Ltd | Eyepiece optical system |
US7301712B2 (en) * | 2003-01-09 | 2007-11-27 | Olympus Corporation | Image-formation optical system, and imaging system incorporating the same |
US6847494B2 (en) | 2003-02-24 | 2005-01-25 | Eastman Kodak Company | Optical magnifier suitable for use with a microdisplay device |
JP2004258653A (en) | 2003-02-24 | 2004-09-16 | Eastman Kodak Co | Optical magnifier suitable for use with microdisplay device |
US20040165283A1 (en) | 2003-02-24 | 2004-08-26 | Cahall Scott C. | Optical magnifier suitable for use with a microdisplay device |
US20040165278A1 (en) | 2003-02-24 | 2004-08-26 | Eastman Kodak Company | Optical magnifier suitable for use with a microdisplay device |
US6785054B1 (en) | 2003-02-24 | 2004-08-31 | Eastman Kodak Company | Optical magnifier suitable for use with a microdisplay device |
US7492533B2 (en) * | 2003-09-10 | 2009-02-17 | Panasonic Corporation | Imaging lens, imaging unit, and optical device |
JP2006106491A (en) | 2004-10-07 | 2006-04-20 | Canon Inc | View finder |
JP2007121340A (en) | 2005-10-25 | 2007-05-17 | Citizen Miyota Co Ltd | Eyepiece for finder |
JP2008096552A (en) | 2006-10-10 | 2008-04-24 | Ricoh Co Ltd | Observing optical system, lens barrel unit, and camera |
JP2008203290A (en) | 2007-02-16 | 2008-09-04 | Sony Corp | Viewfinder |
JP2010175795A (en) | 2009-01-29 | 2010-08-12 | Nikon Corp | Eyepiece optical system |
US20100290129A1 (en) | 2009-05-18 | 2010-11-18 | Nishio Akinori | Eyepiece optical system and electronic view finder incorporating the same |
JP2010266776A (en) | 2009-05-18 | 2010-11-25 | Olympus Imaging Corp | Eyepiece optical system and electronic view finder using the same |
US20110122502A1 (en) | 2009-05-18 | 2011-05-26 | Nishio Akinori | Eyepiece optical system and electronic view finder incorporating the same |
US7969658B2 (en) | 2009-05-18 | 2011-06-28 | Olympus Imaging Corp. | Eyepiece optical system and electronic view finder incorporating the same |
US7978417B2 (en) | 2009-05-18 | 2011-07-12 | Olympus Imaging Corp. | Eyepiece optical system and electronic view finder incorporating the same |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9678328B2 (en) | 2014-06-11 | 2017-06-13 | Fujifilm Corporation | Eyepiece lens and imaging apparatus |
US10025066B1 (en) * | 2017-01-11 | 2018-07-17 | Genius Electronic Optical (Xiamen) Co., Ltd. | Ocular optical system |
US11988895B2 (en) | 2020-08-24 | 2024-05-21 | Canon Kabushiki Kaisha | Observation optical system and apparatus having the same |
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CN102411191A (en) | 2012-04-11 |
US20120127595A1 (en) | 2012-05-24 |
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JP5136618B2 (en) | 2013-02-06 |
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